Assemblage-point device



K. AFZNSTEIN ASSEMBLAGE POINT DEVICE April 16,1928.

Filed June 28. 1920 2 Sheets-Sheet 1 Fig.7

JNVENTUR: I

April 10, 1928.

I K. ARNSTEIN ASSEMBLAGI POINT DEVICE Filed June 28. 1920 2 Sheets-snout 2 Fig/5 J-NVEN TO FR: AQ/r/Wrm Patented Apr. '10, 1928.

UNITED STATES KARL ABNSTEIN, OF IRIEDRICHSHAFEN,

PATENT orrics.

GERMANY, ASBIGNOB TO THE FIRM LUN- RICHSHAI'EN, GERMANY.

assskanaoa-rom'r nnvrcn.

Application fled June 28, 1820, Serial 1'0; $91,488, and in Germany October 18, 1011.

canmnn UI'DIB m PROVISIONS OF THE ACT 0! XARCE 8, 1821, 41 STAT. L, 1318.)

My invention refers to hollow sectional bars used for light structures, and more especially to assemblage oint connections between closed sections tereof.

Though the advantage of using thinwalled closed hollow bars consisting of high quality material for light structures has been recognized for some time, such structural parts have until now been used less than the less strong or, if equally resistive, heavier open sections. The reason for this lies in the fact that open sections with plane faces can far easier be united to form multiple assemblage points than the closed ones, as they are accessible from all sides and make good connections. In light structures and especially in the manufacture of flying machine frames the assemblage of frame works made by riveting on the individual bars are very important.

My invention intends combining the advantages of closed and open hollow bars by changing in an especially simple way the closed hollow sections at their ends into open sections of equal resistance but of far better accessibility. The object of my pres ent invention thus consists in an assemblage point connection for closed sections of the kind mentioned above, in which with the ends of the bars-which are plane or are made plane-one or a plurality of U-shaped connecting pieces are connected directly or by means of separate connections. According to the invention the connecting pieces transmit the bar tensions to the gusset joint plates either by themselves or combined with the side faces of the bars joined with them.

The U-shaped connecting pieces-which in certain cases can be replaced by two V- picces are particularly suitable for transmitting the forces, as thev are easily manufactured owing to their plane faces and further provide good connections for the gusset joint plates. Moreover they can be joined in a very simple manner with plane faces of the closed section. The plane working faces fullv warrant an even tension sustained by all rivets. as had work in riveting or non-fitting rivet heads is absolutely impossible.

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The connecting pieces can be closely applied to the faces of the sections from outsideor inside. In the first-mentioned case x a ]01Ilt connection can be made at the ends of a continuous main boom as well as in its middle ortion. In the end connections proper t e connecting pieces can be elongated beyond the bar ends in outside and in inside connections.

The end connection is made especially suitable by enveloping the connecting pieces to their full length by the bar ends, whose free sides are cut out in a well known manner. This can always be done according to the invention, inasmuch as the connecting pieces on account of their peculiar arrangement transmit the whole force acting upon the sectional bar. Thus the outward shape of such an end is not altered and suflicient space is left for uniting many sections in one joint. The whole joint connection thus becomes very sturdy and light, as all elements to be united can be disposed close to the axis of the boom. Besides the riveting can be extended almost to the int where all axes intersect. The drawing illustrates some modifications of joint connections according to the present invention in a purely diagrammatic manner.

In the drawings Figs. 1, 2, 5 and 8 are cross-sectional views through quadrangular tubes, representing four different modifications of the construction according to the present invention; Figs. 3 and-4 are elevation and plan views, respectively, corresponding to Fig. 2; Figs. 6 and 7 are similar views corresponding to Fig. 5; Figs. 9 and 10 are elevational and plan views respectively corresponding to Fig. 8.

Figs. 11-13 are side views and various cross sections of a plane assemblage pointof an air craft car composed of homogeneous sectional bars. I

Figs. 14-17 are side views and various cross sections of a plane assemblage point with different kinds of sectional bars and connections.

Figs. 18-20 are cross-sectional and longitudinal sectional views of a dismountabl'e connection of a flying machine boom.

faces of the hollow bar mantle are cut out at their ends marked a. A similar construction is shown in Figs. 2, 3 and 4, but there the web faces of both sections B touch directly, so that the flanges b riveted on to two sides of the end of the hollow bar A may be made wider. Fig. 2 shows how due to the cuts all of the remaining sides of the hollow bar connection butts C can be riveted on easilv without making them wider than the height of the bar. The modification according to Figs. 5, 6 and 7 is based upon a hollow bar consisting of two open U bars F and G different .in height. These are combined toaclosed section with two outside .flanges pointing in the same direction. On

account of the inaccessibility of the closed hollow part the ssibility of making connections is limited This fault of the otherwise advantageous shapeof the section can be removed according to the invention by insertin an U-shape connecting piece in the end 0 the hollow space, whose flan s b are riveted on to the flanges of the .wider' U bar F and whose web is riveted on to the web of the narrower U bar G. By cutting away a portion of the wall at the end of the closed hollow member, as shown at; f, theinterior of the member is conveniently accessible for the purpose of fastenin the elements to each other and to provi e the desired joint. 1

The joint according to Figs. '8, 9 and 10 differs from the last-mentioned substantially in the fact that in the interior of a hollow bar F G two U-shaped connecting pieces B are provided, whose webs touch one another and whose flanges are riveted on to the webs of bars F G. In this case the opposite walls of the end of the tube are both cut out so as to form two tapering or oppositely disposed spaced end portions pro ect ing from the tube. The joint ofi'ers still moreuresistance than thataccording to Figs. 5, 6 and 7.

In the .modification according to Figs. 11-13 two booms L and L are united in a 'oint with a traverse bar M and two diagonal ars N and N by means of two butt plates C and C. All the five hollow bars are made of the identical square section. The trans mission of forces is done similarly to Figs. 3 and 4 by inserting in each bar end two 'U-shape connecting pieces riveted together by their webs. As the free sides of the bar endsnot participating in the transmission of forces are cut out, the butt plates C can be riveted easily.

meaa'ra different shape of the homogeneous sectional bars. 'All sectionsarecomposed of two U- bars of different height, which similar to Fig. 8 are united to'a hollow bar possessing two parallel flanges. The transmission of forces to the butt plates C and C is done similarly .to the s ecimen construction in Figs. 8, 9 and 10, t ough the lower'part of the flanges of the traverse bars P is cut off (Figs. 15 and 17) so as to allow the butt plate arranged in front to be directly riveted on to the web of the narrow part of bar P. Y r

As the described joints Show, the connections are absolutely reliable in s ite of their simplicity, as the forces transmitted by the branches are taken up centrally and the connecting rivets are not arranged in the thinwalled main section, but in parts reinforced by connecting pieces rovlded inside or outside. This is highly important with regard to the reliability of the riveting, since in order to obtain constructions of the 'very lowest wel htno matter whether light metal or big class steel be used as materialoften very thin-walled plates and sectionsare employed, in which the friction caused by pressure plays a eat role.

In the joint 'accor mg to Figs. 18-20 the end of a flying machine boom is flattened in the middle and possesses U-shaped inner connecting pieces B with flanges pointin outwards and riveted on to the flat sides 0 the boom. The U-sections B transmit the force from the sectional bar to a hinge bolt, for which they serve at the same time as spacers. The flying machine boom is con nected flexibl with a beamby means of the hinge bolt and two eyes W. As the hinge bolt is arranged transversall to the centre of symmetry of the boom, a uckling of the bar in the direction of the smallest moment of inertia is prevented. Though the connection is easily to be dismounted, a suflicient fixing is obtained. Similar to the modification in Fig. 1 those ends of the section mantle which are not used for transmitting force to the U-shaped inserted piece, are cut out or cut off slantingly. Hereb the riveting is simplified as well as the flexibility is increased without weakening the a sesses comparatively small bar sections by this in-,

vention new applications are opened to the light structure such as light frames for radiotelegraphic purposes.

I do not Want to be limited to the details described orshown in the drawings, as many variations will occur to those skilled in the art.

I claim:

1. A ll ht Weight metal structure of the type descri comprising a stress transmitting member, said member constituting a thin Walled tube, the Walls at one end portion of the tube bein out out to form two oppositely dispose spaced end portions, and e lurality of channel shaped connecting memlS, the channel shaped members having fastening means connecting them to the onpositely disposed spaced end portions, said fastening means bei the cut out walls of ia e accessible through end portion of the ting tube to facilitate fastening the members together,

2. A light Weight mete type described, comprising stress transmitting members, said member constituting a thin walled tube, the Walls at one end per tion of the tube being cut out to form two oppositely disposed spaced end portions, and a plurality of channel shaped connecting members inserted into the out out end portion, the flanges of the chennel shaped 1nembers having means connecting them to the oppositely disposed spaced end portions, said means being accessible through the cut out Walls oi" the end'portion of the tube to facilitate fastening the elements together.

3. A light weight metal structure of the type described, comprising a stress transmitmember, said member constituting a thin walled tube, the wells at one end por tion of the tube being cut out to form two oppositely disposed spaced end portions, and at substantially channel shaped connecting member inserted into the cut out end portion, the Web of the channel member constitnting a transverse connection between the spncedcnd portions, the of th channel shaped member having rivets connecting them to the oppositely disposee spaced end portions, rivets being sccessible through the cut out walls of the end portion of the tube testimony whereoi i seen my signature.

structure of the 

